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Microtops Aerosol Optical Depth
Last modified by Bec Farrell on 2020/08/21 12:10
Aerosol optical depth - Microtops, aerosol optical depth and water vapor, AusCover supersites
Contents
Figure 1: Microtops instrument at Chowilla Supersite.
Link to the data
This data set consists of a shapefile/KMZ file of sunphotometer measurements. Information on the details of the attribute fields for the shapefile/KMZ file are located in this document in the section titled 'Shapefile/KMZ file attributes'.
| Descriptor | Data link | Layer name |
|---|---|---|
| Persistent URL | http://www.auscover.org.au/purl/microtops-aod-all-sites | |
| GeoNetwork record | Not available yet | |
| Data Portal (in development) | http://qld.auscover.org.au/public/html/field/index.html |
Data licence and Access rights
| Item | Detail |
|---|---|
| Rights | Copyright 2010-2020 JRSRP. Rights owned by the JRSRP. Rights licensed subject to Creative Commons Attribution (CC BY). |
| Licence | Creative Commons Attribution 4.0 License, http://creativecommons.org/licenses/by/4.0. |
| Access | These data can be freely downloaded and used subject to the CC BY licence. Attribution and citation is required as described at http://www.auscover.org.au/citation. We ask that you send us citations and copies of publications arising from work that use these data. |
Abstract or Summary
The acquisition of sunphotometer measurements are critical to capture vital data on atmospheric properties during airborne hyperspectral imaging campaigns as well as for measurements coinciding with the overpass of satellite sensors. The atmospheric properties measured are used in atmospheric correction of the remotely sensed image data. This data is primarily for input into atmospheric correction systems. It may also prove of use in validation of aerosol products such as MOD04 and the reflectance change method developed as part of CRC-SI project 4.1 which may be integrated into the Auscover 19 band reflectance product processing. It can also be used to check methods that produce water vapour directly from the data (SODA). The MicroTops instruments referred to here capture solar radiance data in 5 wavelengths which are used to extract information on aerosol optical thickness and water vapour content. These two key parameters of interest are used as inputs for the atmospheric correction of remotely sensed image data.
Spatial and Temporal extents
| Item | Detail |
|---|---|
| Typical spatial resolution (metres) | 1 m |
| Spatial coverage (degrees) | 110.000000 to 155.001329 E, -10.000000 to -45.000512 N |
| Temporal resolution | 1 day |
| Temporal coverage | 2011-04-07 to ongoing |
| Sensor(s) | Microtops sunphotometer |
| Item | Detail |
|---|---|
| Spatial representation type | vector |
| Spatial reference system | WGS 84 |
Point of contact
| Item | Detail |
|---|---|
| Name | Rebecca Farrell |
| Organisation | QLD Department of Environment & Science |
| Position | Scientist (Remote Sensing) |
| rebecca.farrell@des.qld.gov.au | |
| Role | pointOfContact |
| Address | Remote Sensing Centre, DES, EcoSciences Precinct |
| Telephone | +61 7 3170 5459 |
| URL | https://www.des.qld.gov.au |
Credit
The following organisations contributed to the data collection:
- Joint Remotes Sensing Research Project
- Royal Melbourne Institute of Technology
- Curtin University
- University of Adelaide
- CSIRO
Keywords
| Thesauri | Keyword |
|---|---|
| GCMD | EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION COVER |
| CF | vegetation_area_fraction |
| FoR | Environmental Sciences > Ecological Applications = 0501 |
There are three main thesauri that AusCover recommends:
- Global Change Master Directory (http://gcmd.nasa.gov)
- Climate and Forecast (CF) convention standard names (http://cfconventions.org/standard-names.html).
- Fields of Research codes (http://www.abs.gov.au/ausstats/abs@.nsf/0/6BB427AB9696C225CA2574180004463E?opendocument).
Data quality
Some site specific issues relating to data quality may exist. Please see the ancillary data for specific details.
Validation status
This is a validation data set. No validation is intended for this data set.
Related products
| Item | Product link |
|---|---|
| Airborne Hyperspectral | Airborne Hyperspectral |
| Hyperspectral Ground Calibration Data | Hyperspectral Ground Calibration Data |
| Microtops Ozone | Microtops Ozone |
References
| Item | Detail or link |
|---|---|
| Online info | AusCover field calibration/validation home page |
| Online info | Field data collection protocol: Sunphotometer |
Sampling strategy
Data is typically selected at a single location, during overflight, alongside hyperspectral ground calibration data collection. A sample is taken approximately every 10 minutes. Full details of the field data collection are outlined in the field data protocol contained in the references of this document. Deviations from this strategy are outlined in the associated shapefile/KMZ file for this data set.
Product version history
| Version label | Detail |
|---|---|
| 1.0 | Initial release |
Shapefile/CSV file attributes
The information in the following table consist of metadata relating to the attribute fields in both the shapefile and KMZ file relating to this product.
| Data Field | Description (units) | Format |
|---|---|---|
| supersite | AusCover calibration/validation site | Text |
| obs_time | Date and time of observation in local time | Date and Time Stamp |
| longitude | Longitude of target location. Typically refers to plot centre. Method of determination various, see comments for details (decimal degrees) | Float |
| latitude | Latitude of target location. Typically refers to plot centre. Method of determination various, see comments for details (decimal degrees) | Float |
| altitude | Altitude above sea level (m) | Integer |
| observers | Names of field observers | Text |
| sn | Serial number | Integer |
| pressure | Atmospheric pressure (millibars) | Integer |
| sza | Solar zenith: 0 for overhead sun, 90 for sun on horizon (degrees) | Float |
| am | Optical airmass | Float |
| sdcorr | Earth sun distance correction – see manual | Float |
| temperature | Temperature (degrees celsius) | Float |
| id | Identification number - set by user | Integer |
| water | Water vapour column (cm) | Float |
| sig380 | Signal (mV) | Float |
| sig440 | Signal (mV) | Float |
| sig500 | Signal (mV) | Float |
| sig675 | Signal (mV) | Float |
| sig870 | Signal (mV) | Float |
| std380 | Standard deviation of signal | Float |
| std440 | Standard deviation of signal | Float |
| std675 | Standard deviation of signal | Float |
| std870 | Standard deviation of signal | Float |
| r380_440 | Ratio of signals between bands | Float |
| r500_675 | Ratio of signals between bands | Float |
| r440_500 | Ratio of signals between bands | Float |
| r675_870 | Ratio of signals between bands | Float |
| aot380 | Aerosol optical thickness (dimensionless) | Float |
| aot440 | Aerosol optical thickness (dimensionless) | Float |
| aot500 | Aerosol optical thickness (dimensionless) | Float |
| aot870 | Aerosol optical thickness (dimensionless) | Float |
Metadata history
| Date | Detail |
|---|---|
| 2013-03-13 | Metadata creation date |
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